Added documentation for overflow fixed button

docs/README.md

@@ -199,6 +199,23 @@ To create an __action overflow__ menu, create a panel ```data-role="panel"``` wi
 	</ul>
 </div>
 ```
+To add an __action-overflow fixed button__ to the __action overflow__ menu, add a new ```div``` with ```data-role="fixedpanelbutton"```
+Adding this to the previous example would look like the following:
+
+```
+<div data-role="panel" data-position="right" data-display="overlay" data-theme="a" class="bb10-panel">
+	<ul data-role="listview" data-theme="a">
+		<li><a href="#">Acura</a></li>
+		<li><a href="#">Audi</a></li>
+		<li><a href="#">BMW</a></li>
+	</ul>
+	__<div data-role="fixedpanelbutton">
+		<ul data-role="listview" data-theme="a">
+			<li><a href="#">Delete</a></li>
+		</ul>
+	</div>__
+</div>
+```
 
 A complete example of the overflow menus can be found [here](/kitchenSink/actionbar_sample.html).